From MicroStation v8i 08.11.05.171 to the latest v8i ss4 are certified for Windows 7, but be aware that MicroStation CONNECT Edition is a 64 bit build and it won't allow you to install it in a 32 bit OS.

please note that the MicroStation trial version which is available for download on our website (please see the link below) is currently MicroStation CONNECT Edition Update 2 and this is supported ONLY on 64 bit operation systems as Jon mentioned. So you will not be able to install it on Windows 7 32 bit version.